[jdk21u-dev] RFR: 8324668: JDWP process management needs more efficient file descriptor handling

[Martin Doerr]

Clean backport of [JDK-8324668](https://bugs.openjdk.org/browse/JDK-8324668).

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Commit messages:
 - Backport a6632487863db5ff3136cdcc76b7440c15ce6be9

Changes: https://git.openjdk.org/jdk21u-dev/pull/619/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=619&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324668
  Stats: 121 lines in 1 file changed: 106 ins; 12 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/619.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/619/head:pull/619

PR: https://git.openjdk.org/jdk21u-dev/pull/619